Instead of pretending that Biden just had a cold or was jet lagged the Dem spin-doctors should say, "Yep. We have to flick pennies at his forehead to get his attention. Still a better option that the other guy. You want small government, swing voters? He's a 4hr a day President."
And if a reporter asks after Harris, they should just say, "Oh God, no," and then hike a thumb at Biden to express the idea that Harris was Biden's choice in the first place.